点内圆角矩形？ [英] Is Point Inside Rounded Rectangle?

问题描述

  void ContextAddRoundedRect（CGContextRef ctx，CGRect矩形，CGFloat半径）{
 CGFloat minX = CGRectGetMinX（rect）; 
 CGFloat maxX = CGRectGetMaxX（rect）; 
 CGFloat minY = CGRectGetMinY（rect）; 
 CGFloat maxY = CGRectGetMaxY（rect）; 
 
 CGContextMoveToPoint（ctx，minX + radius，minY）; 
 CGContextAddArcToPoint（ctx，maxX，minY，maxX，minY + radius，radius）; 
 CGContextAddArcToPoint（ctx，maxX，maxY，maxX  -  radius，maxY，radius）; 
 CGContextAddArcToPoint（ctx，minX，maxY，minX，maxY  -  radius，radius）; 
 CGContextAddArcToPoint（ctx，minX，minY，minX + radius，minY，radius）; 
} 
  

如何判断给定的CGPoint是否在我的矩形内考虑圆角？

解决方案

不是直接将它构建到 CGContextRef 就像这样，你可以将它构建为 UIBezierPath ，然后使用 - [UIBezierPath containsPoint：] p>

当您准备好实际将路径呈现到上下文中时，您可以通过以下方式进行操作：

  CGContextAddPath（ctx，[myBezierPath CGPath]）; 
  

I have this code to draw rounded rectangles:

void ContextAddRoundedRect(CGContextRef ctx, CGRect rect, CGFloat radius) {
    CGFloat minX = CGRectGetMinX(rect);
    CGFloat maxX = CGRectGetMaxX(rect);
    CGFloat minY = CGRectGetMinY(rect);
    CGFloat maxY = CGRectGetMaxY(rect);

    CGContextMoveToPoint(ctx, minX + radius, minY);
    CGContextAddArcToPoint(ctx, maxX, minY, maxX, minY + radius, radius);
    CGContextAddArcToPoint(ctx, maxX, maxY, maxX - radius, maxY, radius);
    CGContextAddArcToPoint(ctx, minX, maxY, minX, maxY - radius, radius);
    CGContextAddArcToPoint(ctx, minX, minY, minX + radius, minY, radius);
}

how can I figure out if a given CGPoint is inside my rect, considering the rounded corners?

解决方案

Instead of building it directly into the CGContextRef like this, you can build it instead as a UIBezierPath, and then use -[UIBezierPath containsPoint:].

When you're ready to actually render your path into the context, you can do so via:

CGContextAddPath(ctx, [myBezierPath CGPath]);

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